<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
    <h1><a id="login">登录</a></h1>
    <c:if test="${username} != null"><a>用户名：${username }</a></c:if>
    <a>用户名：${username }+<%=request.getParameter("username") %></a>
    <h1><a href="http://127.0.0.1:8888/logout">注销</a></h1>
    <h1><a href="/jsp/login.jsp">转发</a></h1>
    
</body>
<script type="text/javascript">
  var url=window.location.href;
  document.getElementById("login").href="http://127.0.0.1:8888/login?source="+url;
</script>
</html>